Nathaniel a



UNITED STATES PATENT OFFICE. i

VNATHANIEL A. BOYNTON, OF NEW YORK, N. Y., ASSIGNOR TO THE BOYNTONFURNAGE COMPANY, OF SAME PLACE.

HOT-Al R FURNACE' vSPE*CIPIECATION forming part of Letters Patent No.356,980, dated February 1| 1887.

Application filed December 17, 1885. Serial No. 185,900. (No model.)

To all whom t may concern.-

y Be it known that I, NATHANIEL A. BOYN- TON, .a citizen of the UnitedStates, residing in the city of 4New York, in the countyr of New Yorkand State of New York, have invented certain new and useful Improvementsin Hot- Air Furnaces, of which the following is a de-V lscription. Y

evolved from the burning fuel shall take place partly in thecombustionchamber proper and partly in the dues whichlead therefrom, inwhich the unconsumed volatile products of combustion shall pass by adirect course from the front portion to the rear portion of the furnace,and in which the airin the air-warming chamber shall be quickly butthoroughly heated, and shall be conducted by the most direct course fromits point of admissionto such chamber to its point of v dischargetherefrom.

Having in view the accomplishment of these ends, my invention consists,in general, of a furnace which is composed of two distinctindependentlysupported sections. placed at a considerable distance apartand connected by a series of preferably tubular flues, which are securedat one end to the rear portion of the front or combustion-chambersection at a of the combustion-chamber at a point directly opposite thesupply-opening'andimmediately above the upper extremity of thefuel-chamber.

It consists, also, of a novel means in or.in

connection with an upper fine, whereby the` iiow of the products ofcombustion through such upper iiue is restricted and made equ'al orsubstantially equal with the flow through the lower flue.

It consists, also, of various other novel parts or Vcombinations ofparts, whereby the efficiency of the furnace is enhanced, as will be Inthe drawings, Figure l represents a central vertical longitudinalsection from front to rear of a furnace embodying my improvements. Fig.2 is a rear elevation of the front section of the furnace, thetubularflues being removed. AFig. 3 is a front elevation of the rear section ofthe furnace, the tubular flues being removed. Fig. 4. is a horizontalplan view of a section taken on the line w x of Fig.

1. Fig. 5 is a top plan View of the casing of 6o the furnace and itsair-Warming chamber, drawn to a reduced scale.

A is the front or main section of the furnace, A being the ash-chambersection, A2 the firepot or fuel-chamber section, andA3 thecombustion-chamber or domesection of the same.

This main section A'is provided with a lowerV or ash-chamber door, hanupper or feed- `chutedoor, a3, at theouter extremity of the feed-chutea2, and a grate, A4, of any suitable construction. Y

The rear section, B, of the furnace is composed of a main front ordiving-flue section, B', and a rear direct-draft and rising-fluesection, B2. Upon the rear portion of the combustionchamber section A3are provided pipecollars a4 and c5 to receive the lfront ends of tubulardues C and C', similar collars, b and b2,

being provided upon the rear section, B, to reflue-openingor'clearing-opening, and these openings are provided with collars b, b5,b, and bl, the latter of which ordinarily receives the lower extremityof the rear pipe or risingflue section, B2, While a similar collar, bs,upon the rear upper portion of the same section receives the shortdirect exit or direct-draft pipe B3, the opposite end of which 'isfitted upon the collar I)9 of the rising-due section or rear pipe, B2.The section B is seated upon a suitable supporting-base, B4, and thedirect ydraft pipe B3 is provided with a damper, bw, for regulating theflow ofthe products of combustion.

5o hereinafter described. The furnace is inclosedfroin end to end by 10oa casing, D, which at suitable intervals along the lower portion, of itsvertical walls is provided with openings d for the admission of coldair, and at its top, along the central portion thereof, is provided withopenings and corresponding pipes, d', for the discharge of heated air.

Suitable transverse partitions, D', D2, and D, perforated to receive thehorizontal flues C and C', may be employed to divide the airwarmingchamber formed by the casing into distinct compartments, in which thetemperature of the air will vary according to the distance of thecompartment from the combustion-chamber.

As will be seen in the drawings, the flues which extend between the twofurnace-sections are connected to the combustionchamber at a point but ashort distance above the top of the fuel-chamber and directly oppositethe feed-chute. Under this construction the fines for a considerabledistance from the combustion-chamber become highly heated, and it hasbeen found in practice that the gases of combustion are largelyconsumedwithin them, thus heating them to a still higher degree. The combustionchamber or dome section being composed of a single casting, as shown,escape of gases, except into the exit or radiating nues, is prevented.By the provision of the annular flanges b an excessive .escape of theheated currents through the upper iiues is eii'ectually preventedwithout diminishing the radiating-surface of such ilues, and a portionof the heat which would otherwise escape with undue rapidity throughthese fines is directed into the lower ilues, thus rendering them equalin temperature with the upper ilues without diminishing the aggregateheating capacity of all the flues.

Through the extension of the radiating fines in a direct line from theflat rear wall of the combustion-chamber, and in a line leading directlyfrom the doorway of such chamber, the insertion of afiue-eleaner and theremoval of all accumulations of refuse from the fiues are accomplishedwith the utmost facility. By the provision of the lateral openings inthe body of the diving-liuc accumulations of ashes and other refuse arereadily removed.

It will be apparent that under some conditions the rising flue might bemost conveniently attached at one of the sides, instead of at the rear,of the section B, and that in such case ashes and the like would beremoved either through the rear opening or through the side openingopposite to the rising flue.

It will be'obvious that va construction in which the volatile productsof combustion pass in a direct line from the very point of theirproduction to the rear portion of the heater insures a quick heatingaction of such products upon the radiating lines through which theypass, and that a construction in which the air-currents pass almost in adirect line from their point of admission to their point of discharge,and are in their course brought into contact with highly-heatedradiating flues, insures the accomplishment of the general object ofthis invention-that is, the production of a rapid and powerful heater inwhich the currents flow quickly and directly, as contradistinguishedfrom that class in which either the heat-currents or the air-currents,or both, pass by sluggish movements through tortuous channels.

The walls of the casing D, at points opposite the clearing-openings inthe rear furnacesection. will be provided with doors di, and it will beunderstood that either of the collars b Z b b7 may be covered by aclosing-cap, bl.

Having described my invention, I claim- 1. The combination, in a hot-airfurnace, of an ash-chamber, a fuel chamber, a combustionchamber, a reardirect and indirect draft furnacesection, and lower and upper fluesextending from the combustion-chamber to the rear furnace-section, thelower flue being connected to the combustion-chamber at a pointimmediately above the upper extremityof the fire-pot, and being ofuniform capacity from end to end, and the upper flue being contracted atits point of discharge into the rear furnace-section.

2. In a hot-air furnace, the combination of a front section, a rearsection, an upper flue which extends from the front section to the rearsection and is contracted at its rear extremity, and a lower flue whichextends from the front section to the rear section and is of uniformcapacity from end to end.

3. In a hot-air furnace, an ash-chamber, a fuel-chamber above theash-chamber, a com-l bustion-chamber above the fuel-chamber, afuel-supply opening in the front wall of the combustion-chamber, a reardiving-flue section, and aseries of iiues connected to the rear wall ofthe combustion-chamber at apoint opposite the fuel-supply opening anddirectly above the upper extremity of the fuel-chamber and extending tothe rear diving-flue section, all in combination, as described.

4. In a hot-air furnace, the combination of a fuel-chamber, acombustionchamber which has opposite the door thereof and immediatelyabove the upper extremity of the fuel-chamber a series of fiue-openings,a series of tlucs extending rearwardly from the liuc-openings,

yand a rear furnace-section which receives the rear extremity of theflues, such furnace-sec tion being provided with a directdraft pipe, adiving-flue, a rising flue, and an exit-open ing. f

5. In a hot-air furnace, an ash-chamber, a fuel-chamber, acombustion-chamber, a fuelsupply opening in the front wall of thecombustionchamber, a rear furnace-section, and a series of ilues whichare contracted at their rear extremity,extending from the rear of thecombustion-chamber at a point opposite the fuelsupply opening to thefront of the rear furnace-section, in combination, as described.

6. A hot-air furnace which consists, essen tially, of a front sectionwhich is composed of IOO IIO

an ash-chamber, a fuel-chamber, and a coin-V bustion-cha1nber which isprovided with a door or opening in the front thereof, and with a seriesof flue-openings in the rear thereof, directly opposite to or coincidentwith the door or opening, a vrear section embracingy a front diving flueand a rear rising flue and having a series of Hue-openings in the frontwall thereof, and an exit-opening, anda series of ues, each of whicheXtends in line with vthe door or opening from the front section to 8.The combination, with the front fuel- `chamber section, the reardirect-draft and diving an'd rising iiue sections, the intermediateiiues, and the hot-air casing, of the transverse partitions D', D2, andD3, substantially as and for the purposes specified.

y 9. The combination, with a hot-air furnace which embraces a frontsection, a rear section,

.and a series of ii'ues which connect the two sections, of a casingwhich incloses the sections and the flues, and which is divided bytransverse partitions into several transverse airwarming compartmentswhich, when the furnaceis operated, are of unequal temperatures, 35

as and for the'purpose described.

NATHANIEL A. BOYN TON.

Witnesses:

CHARLES M. BENEDIOT, E. J. HARGAN.

